See "What is causing the depletion of the ozone layer?"
CFC's are man made compounds. They are bad for ozone as they deplete it.
The ozone is harmful not at stratosphere. It is harmful at some layer. Te layer is troposphere.
Ozone layer cannot be harmful. It protects us from harmful UV rays of the sun.
the ozone layer is the the part of the atmosphere that screens out harmful radiation from the sun.
Ozone depletion is the process where ozone holes are created in the ozone layer. It is caused due to the action of chloro-floro-carbons on the ozone molecule to break it down to oxygen.
Halogenalkanes are harmful to ozone. They react with ozone and deplete it.
By not affecting it in any way. The manufacture of electronic devices might affect the ozone layer, if that manufacture releases free radicals or freon (chloroflurocarbons) into the atmosphere ... free radicals destroy ozone. However, electronics themselves have no impact on the ozone layer.
Halons are harmful for ozone. They also react with ozone to deplete it.
Ozone layer protects us from harmful UV rays. these are harmful UV radiations of the sun.
Harmful ultraviolet radiations are absorbed by the ozone layer.
CFC's are used in refrigerators. They are extremely harmful for ozone layer.
CFc's are harmful to the stratospheric region of ozone. They deplete it.